import java.util.Scanner;

public class Test1 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int n = in.nextInt();
            int left = 1;
            int right = n;
            int count = 0;
            while (count < n) {
                System.out.print(left);
                count++;
                if (count >= n) {
                    break;
                }
                System.out.print(" " + right);
                count++;
                if (count < n) {
                    System.out.print(" ");
                }
                left++;
                right--;
            }
        }
    }
}
